package cn.bellychang.interceptor;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author ChangLiang
 * @date 2020/9/23
 */
@Configuration
public class InterceptorRegistryConfig implements WebMvcConfigurer {

    @Override
    public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
        configurer.setDefaultTimeout(5000L);
        configurer.registerCallableInterceptors(timeoutInterceptor());
        // 设置使用线程池来驱动callable
        configurer.setTaskExecutor(callableAsyncExecutor());
    }

    @Bean
    public TimeoutCallableProcessingInterceptor timeoutInterceptor() {
        return new TimeoutCallableProcessingInterceptor();
    }

    @Bean
    public ThreadPoolTaskExecutor callableAsyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //配置核心线程数 = restTemplate max connection number
        executor.setCorePoolSize(1);
        //配置最大线程数
        executor.setMaxPoolSize(2);
        //配置队列大小
        executor.setQueueCapacity(40);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix("callable-async-thread-");

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //执行初始化
        executor.initialize();
        return executor;
    }
}
